Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

Arizona’s giant natural wonder reliably strikes awe, whether tackled from inside or above.

Hells Canyon, which is on the border between Oregon and Idaho, is almost 8,000 feet deep. That makes it far deeper than the famous Grand Canyon ... with the Utah Geological Survey.

Weather, gravity and plate tectonics warped and sculpted the exposed layers of surrounding stone into fluid, fantastical forms. The Grand ... canyon – feels almost small compared with all the ...

Strolling through ancient, sun-kissed towns, and feeling the tug of the tide in warm, turquoise waters. Uncovering rich ...

Over the last ten years, strange craters have torn open the icy ground of Siberia’s Yamal Peninsula. These gaping holes, ...

The Bureau of Reclamation has said it will not flood the Grand Canyon this spring because of ongoing work around the Glen ...

Dam maintenance and non-native fish reduction efforts led the government to reject an environmentally restorative flood in the Grand Canyon.

One of the more controversial additions to the Grand Canyon's surroundings, the Grand Canyon Skywalk is a large, semicircular bridge with a transparent glass floor, allowing tourists to walk out ...

After you've admired the Grand Canyon from the hiking trails (or even from the air on a helicopter tour), enjoy a new vantage point on a Colorado River rafting tour. Options range from the family ...

With a maximum depth of 2,436 meters (7,993 feet), it's the deepest river gorge in the entirety of North America (as far as ...

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